One-step fabrication of porous GaN crystal membrane and its application in energy storage.
One-step fabrication of porous GaN crystal membrane and its application in energy storage.
复制标题
多孔氮化镓晶体膜的一步制备及其在储能中的应用
DOI：
10.1038/srep44063
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发表时间：
2017-03-10
影响因子：
4.6
通讯作者：
Hao X
中科院分区：
文献类型：
--
作者：
Zhang L;Wang S;Shao Y;Wu Y;Sun C;Huo Q;Zhang B;Hu H;Hao X
氮化镓(GaN)单晶薄膜具有广阔的应用前景。然而，由于单晶GaN膜的化学惰性和机械硬度，单晶GaN膜的制备仍然是一个挑战。本研究首次采用一步高温退火法制备了大面积、自支撑、单晶多孔GaN薄膜。通过热力学理论分析和实验相结合的综合研究，提出了一种有前景的分离模型。将多孔GaN晶膜加工成循环寿命稳定、高倍率、超高功率密度的超级电容器，完成了新型储能应用的概念验证演示。我们的研究结果有助于GaN晶膜的研究进入与电化学储能应用相关的新阶段。
Single-crystal gallium nitride (GaN) membranes have great potential for a variety of applications. However, fabrication of single-crystalline GaN membranes remains a challenge owing to its chemical inertness and mechanical hardness. This study prepares large-area, free-standing, and single-crystalline porous GaN membranes using a one-step high-temperature annealing technique for the first time. A promising separation model is proposed through a comprehensive study that combines thermodynamic theories analysis and experiments. Porous GaN crystal membrane is processed into supercapacitors, which exhibit stable cycling life, high-rate capability, and ultrahigh power density, to complete proof-of-concept demonstration of new energy storage application. Our results contribute to the study of GaN crystal membranes into a new stage related to the elelctrochemical energy storage application.